18713811 has 4 divisors (see below), whose sum is σ = 24951752. Its totient is φ = 12475872.

The previous prime is 18713791. The next prime is 18713813. The reversal of 18713811 is 11831781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18713811 - 2²² = 14519507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18713813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3118966 + ... + 3118971.

It is an arithmetic number, because the mean of its divisors is an integer number (6237938).

Almost surely, 2^18713811 is an apocalyptic number.

18713811 is a deficient number, since it is larger than the sum of its proper divisors (6237941).

18713811 is an equidigital number, since it uses as much as digits as its factorization.

18713811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237940.

The product of its digits is 1344, while the sum is 30.

The square root of 18713811 is about 4325.9462548673. The cubic root of 18713811 is about 265.4936142115.

The spelling of 18713811 in words is "eighteen million, seven hundred thirteen thousand, eight hundred eleven".